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Thread: Sikorsky X2 coaxial heli developments.
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Old 29th Mar 2008, 10:56
  #236 (permalink)  
bat1
 
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A drawing looking just like the rendering was patented
http://www.google.com/patents?vid=USPATD526269

Five other concept patents are listed on the unicopter website
http://www.unicopter.com/1465.html
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